9. Saagar gives a certain teacher some sass followed by an eye roll. Suddenly, a chankla is thrown at him. The flip-flop moves from rest to 12km/hr when it strikes Saagar in the back
of the head. The flight of the chankla takes only 1.2 seconds. What is the average
acceleration of the chankla?

Because its reliable.   there is no pollution  the chances of a radiation leak is low

The figure is missing but we can answer anyway.the correct answer is "releasing the string". in fact, when the person is holding the bow and the arrow, the kinetic energy of the arrow is still zero (because the arrow is not moving). the moment the arrow is released, it acquires a velocity v, so its kinetic energy will become different from zero: where m is the mass of the arrow and v its velocity.  all the other options, instead, do not increase the kinetic energy of the system: -  pulling farther back on the string : this will just increase the elastic potential energy of the system-  holding the arrow higher: this will increase the gravitational potential energy of the system (which is given by u=mgh, where h is the height above the ground)-  decreasing the mass of the arrow: this will decrease the gravitational potential energy of the system (which is given by u=mgh, where m is the mass)

Iwas thinking the wavelength is one half its original value